Worm-gearing.



PATENTED AUG. 16, 1904.

J. W. MOAKLER. WORM GEARING.

APPLICATION FILED SEPT. s, 1903.

N0 MODEL.

WITNESSES:

the bases 7 of the rollers enter suitably-' UNITED STATES PatentedAugust 16, 1904.

JOHN W. MOAKLER, OF NEW YORK, N. Y.

WORM-GEARING.

SPECIFICATION forming part of Letters Patent No. 767,588, dated August16, 1904. Application filed September 8, 1903. Serial No. 172,278- (Nomodel.)

To all whom it may concern.-

Be it known that I, JOHN W. MOAKLER, a citizen of the United States,residing in the borough of Manhattan, city, county, and State of NewYork, have invented certain new and useful Improvements in Worm-Gearing;and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to improvements in worm-gearing; and it consists ina novel construction comprising teeth having frictionrollers and a novelantifriction-bearing for said rollers.

The objects of my invention are to obtain increased efficiency and toreduce frictional losses in Worm-gearing and to provide Wormgearingaccomplishing the above objects which is nevertheless strong,simple,freefrom liability to derangement, and relatively inexpensive.

I will now proceed to describe my invention with reference to theaccompanying drawing, showing a side view and partial section of a wormand worm-wheel in mesh, the wormwheel being constructed in accordancewith my invention.

The worm l (illustrated in the said drawing) is of substantiallyordinary construction. It is double-threaded. The worm-wheel 2comprisesa base-wheel 3, having teeth formed by friction-rollers 4:, held inplace by pins 5, inserted in suitable openings in the periphery of thebase-wheel. In the drawing one of these friction-rollers is shown inlongitudinal section. The sectional outline of such roller is thesectional outline of an ordinary geartooth. The pins 5 are provided withheads 6 to hold the friction-rollers in place, and to assist said pinsin resisting thrust on the teeth formed circular recesses in the face ofthe base-wheel. The pressure of the worm upon the friction-rollerstherefore causes said rollers to press against the sides of the saidrecesses in the base -wheel as bearings, and hence the strength of thetooth is substantially the same as if it were solid and stationary,while the friction of the gearing is very much less, since it is rotaryinstead of sliding friction.

To reduce the friction of the rollers 4 during their rotation to a lowlimit, I preferably provide said rollers with ball-bearings. For thispurpose each roller is provided at its inner end with a flange beveledon the inside, the recess inclosed thereby forming a ballpocket, and insaid recess are placed bearingballs 9. The sides of the recess 8 and thepins 5 and'bottoms of the recesses in the basewheel form the races.

The pins 5 are slightly tapered. them in place, their inner ends arepreferably split, and screws 10, screwing into the inner ends of saidpins, serve to expand said ends, so as to clamp the pins in place.

In the operation of this gearing the frictionrollers 4 rotate duringtheir period of contact with the teeth of the worm, thereby greatlyreducing the friction.

It is obvious that my invention is not restricted to worm-wheels andthat racks intended to coact with Worms or other spiral gears may haveteeth formed as above described, also that gear-wheels intermeshing withspiral gears may have such teeth. I intend the word gear as usedhereinafter in the claims to include both gear-wheels and racks andintend the words spiral gears as used hereinafter in the claims toinclude what are commonly termed "spiral gears in which the teeth do notform complete helices and worms in which the teeth do form helices.

It is obvious that my invention is susceptible of many variations andmodifications in construction and arrangement of the parts, and I do notlimit myself to the particular details of construction hereinillustrated and described.

' What I claim is 1. In a gear, the combination with a suit-' To retainable base having peripheral recesses corresponding to the several teeth,of teeth comprising bearing-pins projecting from said base andfriction-rollers mounted thereon and set into said recesses and arrangedto bear against the sides thereof, said rollers havingball-races formedin their bases, and means for holding said rollers in place.

3. In a gear, the combination with a suitable base having peripheralrecesses corresponding to the several teeth, of teeth comprisingfriction-rollers set into said recesses, said rollers having at theirinner ends flanges inclosing recesses forming ball-pockets, and meansfor holding the rollers in place.

4:. In a gear, the combination with a suitable base having peripheralrecesses corresponding to the several teeth, of teeth comprisingfriction-rollers set into said recesses, said rollers having at theirinner ends flanges inclosing recesses forming ball-pockets, pinsprojecting from said base, on Which said rollers are mounted, andbearing-balls inclosed Within said pockets.

5. In a gear, the combination With a suitable base having peripheralreeesses corresponding to the several teeth, of teeth comprisingfriction-rollers set into said recesses, said rollers having at theirinner end flanges beveled on the inside, inclosing recesses formingball-pockets, pins projecting from said base, on Which said rollers aremounted, and bearing-balls inclosed Within said pockets and bearingagainst the beveled sides of said flanges, the pins, and the bottoms ofthe recesses in the base. 7

In testimony whereof I ELfElX my signature in the presence of twoWitnesses.

' JOHN W. MOAKLER.

Witnesses:

H. M. MARBLE,

(J. F. GARRINGTON.

